Quantifying the effect of urodynamic catheters on urine flow rate measurement

Harding, Chris; Horsburgh, B.; Dorkin, Trevor J.; Thorpe, Andrew

doi:10.1002/nau.21188

Cited by 9 publications

(6 citation statements)

References 17 publications

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“…Possibly, the test situation – being stressful for the patient – together with the catheter, influence the voiding. Dual catheter cystometry methods seem disadvantageous in this regard, because removal of a separate filling catheter just before (attempted) micturition interferes with lower urinary tract function and may also displace the intravesical pressure-sensing catheter [1,16]. As thin as possible (e.g.…”

Section: Normal Values Reliability and Diagnostic Performancementioning

confidence: 99%

The evidence for urodynamic investigation of patients with symptoms of urinary incontinence

Rosier

2013

F1000Prime Rep

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Urodynamic studies are the gold standard to objectively diagnose dysfunction of the lower urinary tract. The widely available evidence for the clinical relevance is, however, fragmented. This article summarizes the published knowledge supporting the use of urodynamic studies in urinary incontinence in female, male and frail patients, as well as patients with relevant neurological disease. Five technological innovations are discussed briefly. Standard urodynamic cystometry can, on the basis of a solid body of evidence, objectively unveil the entire function of the lower urinary tract in all patients with urinary incontinence, regardless of the patients' perception of (ab-)normality of signs and or symptoms.

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Section: Normal Values Reliability and Diagnostic Performancementioning

confidence: 99%

The evidence for urodynamic investigation of patients with symptoms of urinary incontinence

Rosier

2013

F1000Prime Rep

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“…Our future works include improving the sensitivity of the strain gauge for a wider range of applications (i.e., urinary, neurological, and cardiac) [28]- [30]. Moreover, we plan to better characterize the long-term stability and mechanical integrity of the thin-film piezoresistor.…”

Section: Discussionmentioning

confidence: 99%

Piezoresistor-Embedded Multifunctional Magnetic Microactuators for Implantable Self-Clearing Catheter

et al. 2019

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Indwelling catheters are used widely in medicine to treat various chronic medical conditions. However, chronic implantation of catheters often leads to a premature failure due to biofilm accumulation. Previously we reported on the development of a self-clearing catheter by integrating polymer-based microscale magnetic actuators. The microactuator provides an active antibiofouling mechanism to disrupt and remove adsorbed biofilm on demand using an externally applied stimulus. During an in vivo evaluation of self-clearing catheter, we realized that it is important to periodically monitor the performance of implanted microactuators. Here we integrate gold-based piezoresistive strain-gauge on our magnetic microactuators to directly monitor the device deflection with good sensitivity (0.035%/Deg) and linear range (±30°). With the integrated strain-gauge, we demonstrate the multi-functional capabilities of our magnetic microactuators that enable device alignment, flow-rate measurement, and obstruction detection and removal towards the development of chronically implantable self-clearing smart catheter.

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“…It is well recognized that the goal of UDS (recreating a usual filling micturition cycle) has many obstacles. Besides the stress of being examined, the presence of urethral catheters has been broadly reported to influence the values of maximum flow rate during pressure‐flow study (PFS) 4 . This observation has been confirmed in female population 5,6 and in a myriad of clinical conditions 7 .…”

Section: Introductionmentioning

confidence: 89%

Defining bladder outlet obstruction and detrusor underactivity in females with overactive bladder: Are we forgetting about the free uroflowmetry?

Arévalo-Vega

Ponce

Valdevenito

et al. 2023

Neurourology and Urodynamics

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Introduction: Both detrusor underactivity (DU) and bladder outlet obstruction (BOO) can coexist in patients with overactive bladder. Definitions of both DU and BOO are based on pressure-flow study (PFS) data. However, invasive urodynamics study can differ from a natural micturition, in fact, discrepancies between free uroflowmetry (UFM) and PFS have been largely described. Our goal is to assess the correlation of free-flowmetry and PFS among patients with OAB and to evaluate how different definitions of DU/BOO are able to discriminate patients with different free UFMs. Methods: A retrospective review of urodynamics performed at a single institution was conducted. Females with OAB who voided more than 150 mL in both UFM and PFS were included. Parameters from both voiding episodes were compared with nonparametric test. Two definitions of DU were applied; PIP1: Pdet@Qmax+Qmax < 30 and Gammie: Pdet@Qmax < 20 cmH 2 O, Qmax < 15 mL/s, and BVE < 90% (Bladder voiding efficiency). Also, two definitions of obstruction were chosen; Defretias: Pdet@Qmax ≥25 cmH 2 O and Qmax ≤ 12 mL/s and Solomon-Greenwell female BOO index ≥ 18.Patients who matched with each definition were compared to those who did not, to assess if any definitions were able to discriminate different noninvasive uroflowmetries.Results: A total of 195 patients were included. Overall, mean age was 55 ± 12 years, 90.8% had mixed urinary incontinence, and 39% complained of at least one voiding symptom. Globally, Qmax and BVE correlated poorly between UFM and PFS, showing that most of the variation corresponded to a systematic error. Twenty-two individuals were found to have DU, they had a difference of 13 mL/s on both maximum flows. Fifty-four patients showed BOO, with a difference between their Qmax of 19 mL/s. Among the four definitions analyzed, only PIP1 and Defreitas were able to discriminate patients with actually a lower Qmax on the free UFM.

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Quantifying the effect of urodynamic catheters on urine flow rate measurement

Cited by 9 publications

References 17 publications

The evidence for urodynamic investigation of patients with symptoms of urinary incontinence

The evidence for urodynamic investigation of patients with symptoms of urinary incontinence

Piezoresistor-Embedded Multifunctional Magnetic Microactuators for Implantable Self-Clearing Catheter

Defining bladder outlet obstruction and detrusor underactivity in females with overactive bladder: Are we forgetting about the free uroflowmetry?

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